Latent Scrambled Image
An image formed by differences in the patterns of the element and the background. The encoding process can combine multiple images and make them look as one. The images become clear only when viewed through a specially manufactured decoder lens (fig. 1, b).
a
b
Fig. 1. Latent scrambled image. 100 000 Indonesian Rupiah (2004):
a – without a special decoder; b – with a special decoder